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Serra de Magé   contributed by Anne Black, IMCA 2356   MetBul Link


Roll Overs:     #1   #2    


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View all entries for   Meteorite (3)   Anne Black (497)


Photos by John Kashuba.  

What is a thin section?       What do all the colors mean?    
Thin section in cross polarized light.   Eucrite-cm

TKW 1800 grams. Observed fall 1923, Pernambuco, Brazil.


Anne writes:
John Kashuba sent the following along with his pictures:
Serra de Magé fell in Brazil in 1923. It is a non brecciated, cumulate eucrite. Its composition is one of the highest in feldspar among eucrites. In these cross-polarized light thin section photos the feldspar, which is plagioclase feldspar, appears in grey and cream tones, often showing the shadowy stripes that indicate twinning. The bulk of the remaining minerals are pyroxenes. The pyroxenes are orthopyroxene grains containing prominent lamellae of exsolved augite. Some of these are in complex patterns and some are wormlike. Wider augite laths display discreet colors. The colors differ because their crystal lattices are oriented differently from each other and therefore appear differently in XPL.


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Found at the arrow (green or red) on the map below
 


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Isheyevo
Anne Black

This Month

1 picture in the Queue
Graham Macleod
 3/30/2016 9:50:45 PM		 Beautiful paintings from space Anne.
Anne Black
 3/28/2016 9:04:28 PM		 Glad you like those pictures. And yes John does a great job!
Paul Swartz
 3/28/2016 5:51:16 PM		 Wonderful photos.
Moni
 3/28/2016 12:31:11 PM		 Nice work by John Kashuba!! Amazing pictures!!
John Divelbiss
 3/28/2016 11:30:10 AM		 awesome eucrite...looks like a cousin of Tirhert
MexicoDoug
 3/28/2016 1:50:37 AM		 The parade of eucrites has been great and this is so nicely contrasted in the pretty stained-glass thin section! Edward Anders at Chicago spent time on this "odd meteorite" and decided it had two likely collisions, and the last one occurred a slight blink ago on an astronomical timescale: 1000-5000 years ago. What a fresh harvest ... Thanks for sharing!
 

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